Sofa



FIG. 1 is a front perspective view of a sofa showing my new design.

FIG. 2 is a top view thereof;

FIG. 3 is a side view thereof, an opposite side view being a mirror image thereof; and,

FIG. 4 is a rear perspective view thereof.

The broken lines shown in the drawings are understood to represent stitching. 

CLAIM The ornamental design for a sofa, as shown and described. 